(Program
  (Case
    (Identifier)
    (When
      (Args
        (Identifier))
    {+(Identifier)+}
    {+(When
      {+(Args
        {+(Identifier)+})+}
      {+(Args
        {+(Identifier)+})+}
      {+(Else
        {+(Identifier)+})+})+}))
{-(Case
  {-(When
    {-(Args
      {-(Boolean)-})-}
    {-(StringLiteral)-})-})-})